Re: [monit] Check if a process is running

[eric]

mercadodei mercado a écrit :
> Hello All
> To check if a process is running the only thing I have to do is :
> check process <process> with pidfile "/var/run/<process>.pid"
>   start = "/etc/init.d/<process> start"
>   stop = "/etc/init.d/<process> stop"
> right ?
> and if the process doesn't have pid file  (I know that this question 
> is already answered but I would like to know your opinions)
> Thanks
The lonely way is to ... create a pid file !

Try something like this (if 'nopidfilebinary' is the name of your 
program that does not create pid file) :
-----8<----------------------------------------------------------------------------
check process  nopidfilebinary.pidfile with pidfile 
/var/run/nopidfilebinary.pid
   start program = "/usr/local/bin/nopidfilebinary && (ps -C 
nopidfilebinary -o pid= | tr -d ' ')> /var/run/nopidfilebinary.pid"
   stop program = "test -f  /var/run/nopidfilebinary.pid && kill -TERM 
`cat /var/run/nopidfilebinary.pid` && rm -f  /var/run/nopidfilebinary.pid "
   [...]
-----8<----------------------------------------------------------------------------

Assuming :
1) monit will start the program because pid file is missing, so it MUST 
NOT be started at boot by rc.d init process, or monit will try to start 
a program that is already running.

2) monit should receive a 'stop all' command on machine shutdown mainly 
if 'depends on' allow cleaner stop of your program, else the killall 
will stop your program in raw way.

3) 'ps' is present on your plateforme, as well 'tr' (used to remove 
blanks before PID sent by 'ps'). And 'ps' allow '-C' and '-o' args.

regards